Hypodermic syringe.



No. 766,203. I PATENTED AUG. 2, 1904. R. WALSH.

HYPODERMIG SYRINGE.

APPLIOATION rum no. as, 1003.

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I k 7a 71 V1 71V [5.5195 S." INVEIVTOR A zllfarney .UNITED STATES Patented August 2, 1994.

PATENT OFFicE.

HYPODERMIO SYRINGE- srnerewacrron forming part cf Letters Patent No. 766,203, dated August 2, 1904.

Application filed August 28, 1908- To all whdm, it may concern/5 Be it known that I. RALPH WALSH, of Washington city, in the District of Columbia, have invented a. new and useful Improvement in Hypodermic Syringes, of which the following is a specification.

It is my object to produce a hypodermic syringe in which while all the aseptic conditions are thoroughly maintained the parts shall be assembled together in condition for practically immediate use. v

To this end my invention consists of the novel form of syringe which I will now proceed to describe in connection with the accompanying drawings, forming part of this specification, in which- Figure 1 is a longitudinal axial section of the syringe. Fig. 2 is a similar section of a portion of the syringe with the inner tubular needle n pushed through the cork or stopper '0 so that itsopen point protrudes into the interior of the barrel. Fig. 3 is a view of the hypodermic needle detached.

A is the barrel or reservoir of the syringe, which holds the antitoxin or other fluid to be administered. This barrel, which is made of suitable material, preferably glass, may be of any approved construction. As shown in the drawings it is one of that kind in which the fluid is held between the front end of the barrel and a piston 2, which piston for the purpose of ejecting the fluid can be pressed forward bya suitable plunger inserted through the open rear end of the barrel.

The frontof the barrel is contracted to form a neck a, which preferably is tapering on the interior from front to rear and has its extreme front end slightly contracted with a view to prevent the cork or stopper 0 when it is once inserted from being easily forced in by external pressure or out by interior pressure. The cork or stopper is preferably made of vulcanized rubber and (like all other portions of the syringe) is of course thoroughly sterilized before being put into place.

The needle itself (shown detached in Fig.

2) is whatnot improperly may be termed a double needle or double-pointed needle that is to say, there is a needle formation upon 1 Serial 80.171.082- Clo model.)

opposite ends of the base C. From the front end of the base extends a hypodermic needle n of usual or suitable type. I From the rear end of the base and in axial alinement with the needle n projects a considerably shorter similar needle n, the two being in communication with one another, as shown in Fig. 1. so that fluid forced from the barrel A into needle n may pass therethrough into needle 12.

The shorter needle 12/ is forced down into and almost but not quite through the cork or stopper 0, so as to leave between it and the interior of the barrel a film or thin layer of the stopper, as shown clearly in Fig. 1, thus keeping the metal of the needle n from contact with the fluid within the barrel and at the same time keeping the'inner end of the needle '12. thoroughly protected by the sterilized material in which it is embedded. The needle n itself is of course sterilized before it is inserted into the stopper. This is the normal position of the parts'so long as the syringe is not requir d for use. In order to put it into condition for use, all that is needed is for the operator to take hold of the base C and to push the needle 11' farther in until its point protrudes through and beyond the inner end of the stopper, so as to be in free communication with the interior of the barrel, as shown in Fig. 2. then in this position, the base 0 is in contact with the head of the stopper. The needle 1' is made of such length relatively to the stopper that when pushed home its point will protrude the desired distance beyond the inner end of the stopper, and the length of the neck a of the barrel is such that it will protect the point of,

the needle 72. from any possible contact with the piston 12 when the latter is pushed forward.

The external needle 21 is protected and maintained in aseptic condition by a slender sheath 8, preferably of glass, which'is fitted down over the needle and detachably mounted on the base (1. The sheath hasa beli or conical mouth m, which fits closely down nponarubher or equivalently faced seat A: of corresponding shape on the base'E C, thus, in effect, hermetically sealing the needle against outside influences, while at the same time permiton the base and covering and hermetically ting the sheath to be instantly removed, so as sealing the external needle 11, as set forth.

to expose the needle whenever desired. The 2. In a hypodermic syringe a hypodermic needle )1, sheath N, and seat 1 are sterilized needle a base supporting the same, a conical 5 before the sheath is fitted to its place. a or tapering seat I on said base, and a. sheath 20 What I claim herein as new and of my own covering and lDClOSlDg the needle and formed invention iswith a mouth to ht closely upon said seat and '1. A hypodermic syringe comprising the hermetically seal the needle, as set forth. 7 a v barrel or reservoir A, the stopper 0, closing in testimony whereof I have hereunto set i j W the neck oflthe barrel, the double neleilecogmy hand this 27th day of August, 1903. sisting of t 1e two portions 9:, -n an ase r from opposite ends of which said portions RALPH WALSH project. the portion 11', being inserted in and \Vitnesses: normally extending only part way through Evan. A. Dime, a 5 the stopper 0 and a sheath a, closely seated W. LEE HELMs. i 

